Pseudo-semaphore

Pseudo-semaphore is a weird temperament in which the third harmonic does not have a single consistent mapping. If you want to force it into the regular mapping paradigm you have to think of it as a 2.3.3'.7 temperament.

It's called "pseudo-semaphore" because it has the same MOS structure as semaphore, but 49/48 is not tempered out. Perhaps it's better to think of it as superpyth in which the 4/3 generator has been split in half forming a weird interval that's neither 8/7 nor 7/6.

Interval chain

204.	448.	692.	936.	1180.	224.	468.	712.	956.	0.	244.	488.	732.	976.	20.	264.	508.	752.	996.
9/8	9/7	3/2 (flat)	12/7		9/8~8/7		3/2 (sharp)		1/1		4/3 (flat)		7/4~16/9		7/6	4/3 (sharp)	14/9	16/9

MOSes

5-note (LLLLs, proper)

The 5-note MOS is not much use because only one of the two different mappings shows up. You'd be better off using semaphore[5] or superpyth[5] (or 5edo).

Small ("minor") interval	224.	468.	712.	956.
JI intervals represented	9/8~8/7		3/2
Large ("major") interval	244.	488.	732.	976.
JI intervals represented		4/3		7/4~16/9

9-note (LLsLsLsLs, improper)

Here's where all the action begins. Note that this nine-note scale contains nine 4/3s and nine 3/2s. The only way this is possible with a single mapping for 3 is an equal temperament, and all of these 4/3s and 3/2s are much more accurate than in 9edo.

Small ("minor") interval	20.	244.	264.	488.	508.	732.	752.	976.
JI intervals represented			7/6	4/3 (flat)	4/3 (sharp)		14/9	7/4~16/9
Large ("major") interval	224.	448.	468.	692.	712.	936.	956.	1180.
JI intervals represented	9/8~8/7	9/7		3/2 (flat)	3/2 (sharp)	12/7